ok well i went to a reptile store here i am located in chicago, i was going to buy some re cal w/ and w/o D3 also the multivitamin. Now the person at the pet store told me that i did not need to buy rep-cal without D3 since my Cham will mainly be indoors because of the weather in my state he will get everything he needs from the UVB light.. now this really got me confused because all i have read so far here is to get all three. Rep cal w/ and w/o D3 as well as the multiviatimin if anyone can help me out thank you. Also i have not bought my Cham yet i am waiting to have everything ready for him, thought i would but now im stuck.